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IL-22 promotes formation of MUC17 glycocalyx barrier in postnatal small intestine during weaning

ABSTRACT: The intestine is under constant exposure to chemicals, antigens and microorganisms from the external environment. Apical aspects of absorptive epithelial cells form a brush border membrane (BBM), shaped by packed microvilli coated with a dense glycocalyx. We present evidence showing that the glycocalyx forms an epithelial barrier that prevents exogenous molecules and live bacteria from gaining access to BBM. We used a multi-omics approach to investigate function and regulation of membrane mucins exposed on the BBM during postnatal development of the mouse small intestine. Muc17 was identified as a major membrane mucin in the glycocalyx that was specifically upregulated by IL-22 as part of an epithelial defense repertoire during weaning. High levels of IL-22 at time of weaning reprogrammed neonatal postmitotic progenitor enterocytes to differentiate into Muc17-expressing enterocytes, as found in adult intestine during homeostasis. Our findings propose a role for Muc17 in epithelial barrier function in small intestine.

ORGANISM(S): Mus musculus

PROVIDER: GSE164552 | GEO | 2021/02/16

REPOSITORIES: GEO

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IL-22 promotes postnatal formation of MUC17 glycocalyx barrier that protects host enterocytes

Project description:The apical aspects of absorptive epithelial cells form a highly organized brush border membrane (BBM), shaped by densely packed microvilli that are coated with a glycocalyx. Here, we present evidence showing that the glycocalyx forms an epithelial barrier that prevents exogenous molecules from gaining access to the BBM. We used a multiomics approach to investigate function and regulation of membrane mucins exposed on the enterocytic BBM during postnatal development of the small intestine. Muc17 was identified as a major membrane mucinin the glycocalyx that was specifically upregulated by IL-22 as part of an epithelial defense repertoire during suckling-weaning transition. High levels of IL-22 at the time of weaning primed progenitor enterocyte to express Muc17 as they migrate out of intestinal crypts to replace neonatal enterocytes. Our findings propose a role for membrane mucin Muc17 in epithelial barrier function in the small intestine.

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IL-22 promotes formation of MUC17 glycocalyx barrier in postnatal small intestine during weaning

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